Outdoor Test of Radio Tomographic Imaging (IMAGE) University of Utah Caption University of Utah electrical engineer Neal Patwari walks around inside a square grid of radio transceivers (mounted on plastic pipes) during a test of a radio tomographic imaging (RTI) system that uses radio waves to "see," locate and track a moving person -- even a person moving behind a solid wall. Credit Joey Wilson, University of Utah. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.